AP Unit 3 Quiz - IMFs

What is the correct shape and angle for Sulfur Dioxide, SO₂?

• Bent, 105

• Linear, 180

• Trigonal Planar, 120

• Bent, 117

What is true about the molecular polarity of Sulfur Dioxide, SO₂?

• Nonpolar

• Polar

What is the correct shape and angle for Carbon Dioxide, CO₂?

• Bent, 105

• Linear, 180

• Trigonal Planar, 120

• Bent, 117

What is true about the molecular polarity of Carbon Dioxide, CO₂?

• Nonpolar

• Polar

The boiling point of Carbon Dioxide, CO₂, is -78⁰C. The boiling point of Sulfur Dioxide, SO₂, is -10⁰C.

Explain the difference in these physical properties. Include the type of IMFs for both molecules in your explanation.

Which of the following molecules are polar? (check all that apply)

• Water, H₂O

• Methane, CH₄

• Ammonia, NH₃

• Methanol, CH₃OH

Chlorine, Cl₂, is a gas at room temperature, where as bromine, Br₂, is a liquid under the same conditions.

Explain these observations with reference to their intermolecular forces.

In ethanol, C₂H₅OH (l), there are covalent bonds, hydrogen bonds and dispersion forces. Which bonds or forces are broken when ethanol is vaporized?

• only hydrogen bonds

• covalent bonds and hydrogen bonds

• covalent bonds and dispersion forces

• hydrogen bonds and dispersion forces

Why is the boiling point of PH₃ lower than that of NH₃?

• PH₃ is non-polar whereas NH₃ is polar.

• PH₃ is not hydrogen bonded whereas NH₃ is hydrogen bonded.

• Dispersion forces are weaker in PH₃ than in NH₃.

• The molar mass of PH₃ is greater than that of NH₃.

Which order is correct when the following compounds are arranged in order of increasing (lowest to highest) melting point?

• CH₄ < H₂S < H₂O

• H₂S < H₂O < CH₄

• CH₄ < H₂O < H₂S

• H₂S < CH₄ < H₂O